传送：这里 Problem Description John has n points on the X axis, and their coordinates are (x[i],0),(i=0,1,2,…,n−1).…

传送门：POJ1316 In 1949 the Indian mathematician D.R. Kaprekar discovered a class of numbers called self-numbers. …

传送门：【HDU5536】Chip Factory 题意：给n(n<=1000)个数，选三个数a[i],a[j],a[k](i!=j&&i!=k&&j!=k)，使得(a[i]+a[j…